US2025105982A1PendingUtilityA1

Techniques for sidelink retransmission of an access link transport block

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Assignee: QUALCOMM INCPriority: Mar 24, 2022Filed: Mar 24, 2022Published: Mar 27, 2025
Est. expiryMar 24, 2042(~15.6 yrs left)· nominal 20-yr term from priority
Inventors:Zhichao ZhouSeyedkianoush Hosseini
H04W 72/232H04W 72/11H04W 72/40H04L 1/1812H04W 72/563H04W 72/25H04L 2001/0097H04L 1/1887H04L 1/1854H04L 1/1861H04L 5/0044H04L 5/0055
54
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Claims

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to another UE via a sidelink, a feedback communication associated with a transport block in a physical downlink shared channel (PDSCH), wherein the feedback communication is transmitted via a sidelink feedback channel that is associated with the PDSCH. The UE may receive, from the other UE, a retransmission of the transport block based at least in part on the feedback communication being transmitted in the sidelink feedback channel that is associated with the PDSCH. Numerous other aspects are described.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . An apparatus for wireless communication at a user equipment (UE), comprising:
 a memory; and   one or more processors, coupled to the memory, configured to:
 transmit, to another UE via a sidelink, a feedback communication associated with a transport block in a physical downlink shared channel (PDSCH),
 wherein the feedback communication is transmitted via a sidelink feedback channel that is associated with the PDSCH; and 
 
 receive, from the other UE, a retransmission of the transport block based at least in part on the feedback communication being transmitted in the sidelink feedback channel that is associated with the PDSCH. 
   
     
     
         2 . The apparatus of  claim 1 , wherein the UE and the other UE are in wireless communication with a network entity that transmitted the transport block via a groupcast communication, and
 wherein the PDSCH is associated with the groupcast communication.   
     
     
         3 . The apparatus of  claim 1 , wherein the one or more processors are further configured to:
 receive, from a network entity, a configuration associating the sidelink feedback channel with the PDSCH.   
     
     
         4 . The apparatus of  claim 3 , wherein the PDSCH is associated with one PDSCH resource of multiple semi-persistently scheduled (SPS) PDSCH resources,
 wherein the sidelink feedback channel is associated with one sidelink feedback channel resource of multiple SPS sidelink feedback channel resources, and   wherein the configuration associates each of the multiple SPS sidelink feedback channel resources with a corresponding PDSCH resource of the multiple SPS PDSCH resources.   
     
     
         5 . The apparatus of  claim 4 , wherein each of the multiple SPS PDSCH resources is associated with a priority value, and
 wherein the configuration associates each of the multiple SPS sidelink feedback channel resources with a PDSCH resource associated with a corresponding priority value that exceeds a priority value threshold.   
     
     
         6 . The apparatus of  claim 3 , wherein the configuration further configures a sidelink feedback resource pool, and
 wherein the sidelink feedback channel is associated with a subset of resources of the sidelink feedback resource pool.   
     
     
         7 . The apparatus of  claim 6 , wherein the one or more processors are further configured to:
 receive, from the network entity, a downlink control information (DCI) message including an indication of the subset of resources.   
     
     
         8 . The apparatus of  claim 7 , wherein the indication of the subset of resources indicates a time offset parameter and a frequency offset parameter,
 wherein the time offset parameter indicates a time offset from a first time resource of the sidelink feedback resource pool to a start of time resources of the subset of resources, and   wherein the frequency offset parameter indicates a frequency offset from a first frequency resource of the sidelink feedback resource pool to a start of frequency resources of the subset of resources.   
     
     
         9 . The apparatus of  claim 6 , wherein the one or more processors are further configured to:
 receive, from the network entity, a downlink control information (DCI) message scheduling the PDSCH, wherein the DCI message activates the sidelink feedback resource pool.   
     
     
         10 . The apparatus of  claim 9 , wherein the subset of resources are randomly selected from the sidelink feedback resource pool by the UE. 
     
     
         11 . The apparatus of  claim 3 , wherein the one or more processors are further configured to:
 receive, from the network entity, a downlink control information (DCI) message scheduling the PDSCH,
 wherein the DCI message indicates resources associated with the sidelink feedback channel. 
   
     
     
         12 . The apparatus of  claim 11 , wherein the DCI message includes a frequency domain resource assignment (FDRA) associated with the sidelink feedback channel and a time domain resource assignment (TDRA) associated with the sidelink feedback channel. 
     
     
         13 . The apparatus of  claim 1 , wherein the one or more processors are further configured to:
 receive, from the other UE via a sidelink control information (SCI) message, a configuration associating the sidelink feedback channel with the PDSCH.   
     
     
         14 . An apparatus for wireless communication at a UE, comprising:
 a memory; and   one or more processors, coupled to the memory, configured to:
 receive, from another UE via a sidelink, a feedback communication associated with a transport block in a physical downlink shared channel (PDSCH),
 wherein the feedback communication is transmitted via a sidelink feedback channel that is associated with the PDSCH; and 
 
 transmit, to the other UE, a retransmission of the transport block based at least in part on receiving the feedback communication in the sidelink feedback channel that is associated with the PDSCH. 
   
     
     
         15 . The apparatus of  claim 14 , wherein the UE and the other UE are in wireless communication with a network entity that transmitted the transport block via a groupcast communication, and
 wherein the PDSCH is associated with the groupcast communication.   
     
     
         16 . The apparatus of  claim 14 , wherein the one or more processors are further configured to:
 receive, from a network entity, a configuration associating the sidelink feedback channel with the PDSCH.   
     
     
         17 . The apparatus of  claim 16 , wherein the PDSCH is associated with one PDSCH resource of multiple semi-persistently scheduled (SPS) PDSCH resources,
 wherein the sidelink feedback channel is associated with one sidelink feedback channel resource of multiple SPS sidelink feedback channel resources, and   wherein the configuration associates each of the multiple SPS sidelink feedback channel resources with a corresponding PDSCH resource of the multiple SPS PDSCH resources.   
     
     
         18 . The apparatus of  claim 17 , wherein each of the multiple SPS PDSCH resources is associated with a priority value, and
 wherein the configuration associates each of the multiple SPS sidelink feedback channel resources with a PDSCH resource associated with a corresponding priority value that exceeds a priority value threshold.   
     
     
         19 . The apparatus of  claim 16 , wherein the configuration further configures a sidelink feedback resource pool, and
 wherein the sidelink feedback channel is associated with a subset of resources of the sidelink feedback resource pool.   
     
     
         20 . The apparatus of  claim 19 , wherein the one or more processors are further configured to:
 receive, from the network entity, a downlink control information (DCI) message including an indication of the subset of resources.   
     
     
         21 . The apparatus of  claim 20 , wherein the indication of the subset of resources indicates a time offset parameter and a frequency offset parameter,
 wherein the time offset parameter indicates a time offset from a first time resource of the sidelink feedback resource pool to a start of time resources of the subset of resources, and   wherein the frequency offset parameter indicates a frequency offset from a first frequency resource of the sidelink feedback resource pool to a start of frequency resources of the subset of resources.   
     
     
         22 . The apparatus of  claim 16 , wherein the one or more processors are further configured to:
 receive, from the network entity, a downlink control information (DCI) message scheduling the PDSCH, wherein the DCI message indicates resources associated with the sidelink feedback channel.   
     
     
         23 . The apparatus of  claim 22 , wherein the DCI message includes a frequency domain resource assignment (FDRA) associated with the sidelink feedback channel and a time domain resource assignment (TDRA) associated with the sidelink feedback channel. 
     
     
         24 . The apparatus of  claim 14 , wherein the one or more processors are further configured to:
 transmit, to the other UE via a sidelink control information (SCI) message, a configuration associating the sidelink feedback channel with the PDSCH.   
     
     
         25 . An apparatus for wireless communication at a network entity, comprising:
 a memory; and   one or more processors, coupled to the memory, configured to:
 transmit, to a group of user equipments (UEs), a transport block in a physical downlink shared channel (PDSCH); and 
 transmit, to the group of UEs, a configuration associating a sidelink feedback channel with the PDSCH. 
   
     
     
         26 . The apparatus of  claim 25 , wherein the group of UEs are in wireless communication with the network entity via a groupcast communication, and
 wherein the PDSCH is associated with the groupcast communication.   
     
     
         27 . The apparatus of  claim 25 , wherein the PDSCH is associated with one PDSCH resource of multiple semi-persistently scheduled (SPS) PDSCH resources,
 wherein the sidelink feedback channel is associated with one sidelink feedback channel resource of multiple SPS sidelink feedback channel resources, and   wherein the configuration associates each of the multiple SPS sidelink feedback channel resources with a corresponding PDSCH resource of the multiple SPS PDSCH resources.   
     
     
         28 . The apparatus of  claim 25 , wherein the configuration further configures a sidelink feedback resource pool, and
 wherein the sidelink feedback channel is associated with a subset of resources of the sidelink feedback resource pool.   
     
     
         29 . A method of wireless communication performed by a user equipment (UE), comprising:
 transmitting, to another UE via a sidelink, a feedback communication associated with a transport block in a physical downlink shared channel (PDSCH),
 wherein the feedback communication is transmitted via a sidelink feedback channel that is associated with the PDSCH; and 
   receiving, from the other UE, a retransmission of the transport block based at least in part on the feedback communication being transmitted in the sidelink feedback channel that is associated with the PDSCH.   
     
     
         30 . The method of  claim 29 , further comprising:
 receiving, from a network entity, a configuration associating the sidelink feedback channel with the PDSCH.

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